Duplex pumping engine



F. E. STEVENSON.

DUPLEX PUMPING ENGINE. APPLICATION FILED FEB. 19, 1921.

Patented Oct. 17, 1922.

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DUPLEX PUMPING ENGINE. APPLICATION FILED FEB. 19. 1921.

Patented Oct. 17, 1922.

5 SHEETSSHEET 2.

F. E. STEVENSON. DUPLEX PUMPING ENGINE. APPLICATION FILED FEB. 19. 192x.

Patented Oct. 17, v1922.

5 SHEETS-SHED a.

F. E. STEVENSON. DUPLEX PUMPING ENGINE. APPLICATION man FEB. 19, I921.

Patented Oct. 17,1922.

5 SHEETS-SHEET] 5.

Patented Oct. 17, 1922.

TED STATES ,nata

PANT FHQE.

FRANCIS E. STEVENSON, or MOUNT GILEAD, onro, AssIsNon To THE HYDRAULIC PRESS MANUFACTURING COMPANY, or MOUNT GILEAD, 01110.

DUPLEX PUMPING ENGINE.

Application filed February 19, 1921. Serial No. 44 6,260.

T 0 all whom it may concern:

Be it known that I, Francis E. STEVEN-,

tain new and useful Improvements in Du-' plex Pumping Engines, of which the fol lowing is a specification.

This invention relates to duplex pumping engines of the kind in which. a plurality of pumps are each operated by a steam engine and are so actuated as to maintain a continuous flow of water through the supply pipes free from concussion or shocks. Such duplex pumping engines have heretofore been so constructed that each engine is capable of operating its own steamyvalves, either separately or together with the valves of the other engine, so that each engine can be worked separately when for any cause the steam engine or pump of the other set is not in working order, or both engines may be operated in unison. v

According to my invention 1- provide an improved valve gear whereby the steam valves of each engine are actuated by the other engine when geared for conjoint operation and the construction is also such that if either engine is disabled the other engine, by a slight change in "the mecha nism, may be made to operate its own valves while the disabled engine remains at-rest.

My improved valve gear is especially de signed for use in pumping engines employing the well known Burnham or Dean valves, in which an auxiliary valve actuated from the pump'cross head is employedto control the steam admission to a piston valve, which in turnoperates the engine slide valve.

In the accompanying drawings,

Figure 1 is a plan view of a duplex pumping engine showing the steam cylinders and the valve mechanism thereohthe pumps being omitted;

Figure 2 shows a side elevation of the parts shown in Fig. 1; y

Figure 3 is a local section on the line 33 of Fig. 2';

Figure 4 shows a side elevation of the valve mechanism employed when only one of the pumps is operated; I J 1 Figure 5 is a plan view of the mechanism shown in Figure 4:;

Figure 6 shows a vertical section of parts of a Burnham valve employed the steam engines;

Figure 7 shows a horizontal section of a Burnham valve;

Figures 8 to 14, inclusive, are perspective views of different parts of the mechanism employed in my improved valve gear.

Two steam engine cylinders A and B, of

well-known construction, are supported on a bed-plate 0. Each cylinder is equipped with Burnham valve mechanism D, to which steam is admitted at d and from which steam is exhausted at d. It will be understood that the Burnham valve comprises, briefly stated, a slide valve 6, which is operated by a double piston valve 6, to

which it is directly connected at 6 The piston valve is operated by steam admitted by suitable ports controlled by an auxiliarg valve f, to which is connected a valve rod actuated in the manner hereinafter described. Each of the cylinders A and B is equipped with a Burnham valve of the kind above described and shown more in detail in Figures 6 and 7. It will be understood, however, that my improvements may be applied to other kinds of valves, but the mechanism specifically shown in the drawings is especially adapted to operate in conas these are of well-known construction the manner in which they operate need not be here described.

The inner cylinder head of each steam engine is attached to the ends of four frame bars G, which in ractice extend to the pump with which the engine is associated, but which is not shown in the drawings. Each steam engine piston rod H'reciprocates in the space between the four frame bars and each piston rod carries a cross head K, provided with a headed pin is.

The valve rods F of the Burnham valves are operated in the manner soon to be described, observing first, however, that the valve rodof one engine is operated from the piston rod of the other engine. Neither engine operates its own valves when workwhich are clamped to the frame bar by. bolts Z, as shown in Figures 2 and 3. The arms M, M of they frame L have. bearings for two rock-shafts N and O, which extend fron the arms of the frame L on one side of the engine to the corresponding arms on the opposite side thereof, as shown in Figure 1. Each bracket L has a part 1, formed with a hole p, through which a valve rod F extends, and in which it: is guided, and said part P is also formed with a. guide 9, in: which operates a. valve rod actuating device (,1, which, as shown, is in the form of: a. cylindrical block. The opposite ends of the block are adapted toengage nuts r, r, on the screw-threaded portion of a; valve; rod; F.

As viewed from theup per side of. Figure 1, the engine A is on the left-ehand. side of the duplex pumping apparatus and the engine B on the right-hand side thereof.

The end of the rock shaft O on. the. left handrside of the engine, has. keyed orothe-rwise-secured to it an armS, the outer end of which is DlIl-JOlIllJGClat ate a hnle S", 111- turnpln-jointed att. to the outer end ofza lever T, pivoted atJf to the bracketL, and having agslotted endv t engaging the cross head pin 7a,

The rock-shaft. Na inlike manner. carries. an arm S connected by a linln S vv1th; a.

lever. T similar in. all: respectsrto the lever T andhavlng a slotted lower end connected with the cross head pin in of the right-hand engine. The roek-shaft,N has secured to itsleft-hand end. a camnU, having a camslot u,.into.whichprojects a roller a, carried by a pm 26 carried by.. the. cyllndrical block The pin. a is connected to the block. Q by. a squared partui,operating in between the links 8, S and thearmsS'and S are detachable andthe cams U,.U are also detachably. connected with the; rock.- shafts .N and O.-

\Vhen both engines are operating the cross head of engine-A through the leverT, link S, arm Sand. rockrshaft O, operates: the

cam on the right-hand side of:theengine and in like manner the cross head pm of the engine B operates by means of the lever-T link S arm S and shaft-N, the camiU on the left-hand side of the engine; E'ach cam operates its roller a, givingmovement to a block Q,- which strikes against the nuts 03 andrthusoperates the auxiliary valve of the engine with which it isronnected The C2ll11-SlOfi-Of62tQlf cam U, U is-of each part of the stroke of the pump.

course properly shaped, as shown, to move the valve operating. device Q at the proper intervals and to the proper extent and the cross heads K and the mechanism operated thereby are also properly disposed, as P shown, to cause the engine to operate properly when working together.

When. the. engines are operating together there should be some lost motion during The steam valves, the cams and the other mechanism shown are suitable for this purpose. Obviously, however, the, mechanism. may be of such kind as tooperate without the lost motion referred to.

Should one. of the enginesbecome disabled, the other; would be put out of operation also. In such case provisionis made for operating the companion. engine. To do this-the. slotted: cam Ofi such, engine; is detached from; its.v rockeshaft and is replaced by a slottedcam U as-indicatedin Figure 4., havingv a. cam slotwut, suitably shaped to operate. the engine with which it is associated, without in any way disturbing the disabled engine; Assuming that the; righthand engine is.disabled,. its link S should be: disconnected; from the; arm S and the link. S should be disconnected from the lever T. The arm S should'be slid tothe left-hand end: of the rook-shaft N and the link; S. swung oven and'connected to said arm. St.- WVhen thus connected the left handengine can operate alone, while theothen; engine is" undergoing repairs. The linkS may be allowed tofdrop/ and remain idle while still connected to the lever 1 When the engine BzlS put injworking order the necessary parts may be'shifted'and again. connected in the: manner before described and 105 as shown in Figures LanchQ. I

. Itzwill thus :be seen that by. a. very simple mechanism provisionv is made-for. operating the. duplex. pumps in perfect harmony, the mechanismbeing of simple construction and. of-suchnature thatshould one ofthe pumps become disabled the: operation of the other pump:may be continued without. delay.

I: claim asmy invention:

1. Inaduplex. pumping engine, the com= bination of the enginexcylinders, valves and piston rods-of a: cross headcarried by each piston rod, a valve rod'fer each engine, rock? shafts extending from one engine to the other, a lever operatively connected with; eachcross-head, a linlcjointedito each lever and detachably connected therewith, an arm on each rock-shaft and: mounted toslide thereon, a detachable connection, between each armiandaxlink connects itwith a-v lever, a cam detachably: connected with each. of said rock-shafts, and-1' connections between each cam andaivalve rod.

2. In a duplex pumping engine havingtwo steam cylinders-With their pistons and piston rods and valves, the combination of valve rods connected to send valves, and connecting means between the piston rods and valve rod of the other engine, and in the other of Which, the piston rod of each engine operates only its oWn valve rod.

3. In a duplex pumping engine having two steam cylinders With'their pistons and piston rods and valves, the combination of valve rods connected to said valves, and a train of connections between each piston rod and the valve rod of the other engine, an element of each train of connections being adjustable to a second position in Which it may be connected to the opposite train of connections, so that the piston. rod of either engine will operate only its own valve rod.

4. In a duplex pumping engine having two steam cylinders with their pistons and piston rods and valves, the combination of valve rods connected to said valves, and a train of connections between each piston rod and the valve rod of the otherengine comprising a rock shaft, an element of each train of connections being slidable along said rock shaftto a second position in which it may be connected to the opposite train of connections, so that the piston rod of either engine will operate only its own valve rod.

In testimony whereof, I have hereunto subscribed my, name.

FRANCIS E. STEVENSON. 

